geometry things to know review for regents

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5 Terms

1
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centroid

the intersection of two or more medians in a triangle

2
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orthocenter

the intersection of two or more altitudes in a triangle

3
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90 ccw rotation

(x,y) ->(-y,x)

4
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180 ccw rotation

(x,y)->(-x,-y)

5
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270 ccw rotation

(x,y)->(y,-x)